File: xmalloc.c

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/* xmalloc.c -- malloc with out of memory checking
   Copyright (C) 1990-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published
   by the Free Software Foundation; version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#define VOID void

#include <sys/types.h>

#if STDC_HEADERS || _LIBC
#include <stdlib.h>
static VOID *fixup_null_alloc (size_t n) __THROW;
VOID *xmalloc (size_t n) __THROW;
VOID *xcalloc (size_t n, size_t s) __THROW;
VOID *xrealloc (VOID *p, size_t n) __THROW;
#else
VOID *calloc ();
VOID *malloc ();
VOID *realloc ();
void free ();
#endif

#include <libintl.h>
#include "error.h"

#ifndef _
# define _(str) gettext (str)
#endif

#ifndef EXIT_FAILURE
#define EXIT_FAILURE 4
#endif

/* Exit value when the requested amount of memory is not available.
   The caller may set it to some other value.  */
int xmalloc_exit_failure = EXIT_FAILURE;

static VOID *
fixup_null_alloc (size_t n)
{
  VOID *p;

  p = 0;
  if (n == 0)
    p = malloc ((size_t) 1);
  if (p == 0)
    error (xmalloc_exit_failure, 0, _("memory exhausted"));
  return p;
}

/* Allocate N bytes of memory dynamically, with error checking.  */

VOID *
xmalloc (size_t n)
{
  VOID *p;

  p = malloc (n);
  if (p == 0)
    p = fixup_null_alloc (n);
  return p;
}

/* Allocate memory for N elements of S bytes, with error checking.  */

VOID *
xcalloc (size_t n, size_t s)
{
  VOID *p;

  p = calloc (n, s);
  if (p == 0)
    p = fixup_null_alloc (n);
  return p;
}

/* Change the size of an allocated block of memory P to N bytes,
   with error checking.
   If P is NULL, run xmalloc.  */

VOID *
xrealloc (VOID *p, size_t n)
{
  if (p == 0)
    return xmalloc (n);
  p = realloc (p, n);
  if (p == 0)
    p = fixup_null_alloc (n);
  return p;
}